Effects of Mg Addition with Natural Aging Time on Two-Step Aging Behavior in Al-Mg-Si Alloys
- Resource Type
- Authors
- Jiwoo Im; JaeHwang Kim
- Source
- Journal of nanoscience and nanotechnology. 18(3)
- Subject
- 010302 applied physics
Materials science
Two step
Natural aging
Biomedical Engineering
Analytical chemistry
High resolution
Bioengineering
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Transmission electron microscopy
Phase (matter)
0103 physical sciences
General Materials Science
0210 nano-technology
- Language
- ISSN
- 1533-4880
Influence of Mg contents with the natural aging (NA) time on the two-step aging behavior in Al-Mg-Si alloys is studied. Hardness is gradually increased during NA in the 3M4S, whereas dramatic increase of hardness after NA for 3.6 ks is confirmed in the 9M4S. Similar peak hardness is confirmed between the two-step aged and single aged samples in the 3M4S. It means that there is no negative effect of two-step aging. On the other hand, the peak hardness is decreased for the naturally-aged sample compared with the single aged one in the 9M4S. Formation of Cluster (1) is accelerated by the Mg addition, resulting in the negative effect of two-step aging. Meanwhile, the formation of the precipitates is accelerated by Mg addition during aging at 170 °C. The precipitate formed at the peak hardness during aging at 170 °C after natural aging for 43.2 ks is identified as the β″ phase based on the high resolution transmission electron microscope observation.